“Our violence operates far outside the bounds of any other species.  Human beings kill anything.  Slaughter is a defining behavior of our species.  We kill all other creatures, and we kill our own.  Read today’s paper.  Read yesterday’s, or read tomorrow’s.  We kill our- selves in suicide.  We kill friends, rivals, coworkers, & classmates.  Children kill children, in school and on the playground. ”

R. Douglas Fields, Why We Snap, p. 286, 2016. R. Douglas Fields is senior investigator at the National Institutes of Health in Bethesda, Maryland.